However, in the process of brain development, there may be some minor difficulties. For some reason, fetal brain development is abnormal. In order to avoid this abnormality, the doctor will ask the mother to do some tests to check the abnormal development of the fetal brain, so as to discharge the abnormality and ensure the healthy development of the fetal brain.
0 1 When and what tests can we do to see if the fetal brain is developing normally?
Generally speaking, the examination of normal brain development is done in the second trimester. After all, the brain of the fetus in the second trimester has differentiated and gradually formed, and the fetus has a human shape, so the examination is clearer and more careful. So in the second trimester, at these stages, we will do an examination to check the development of the fetal brain. Pregnant women must follow the doctor's advice and don't miss the time.
NT check-up: The best time for NT check-up is1113 weeks +6 days, which is very demanding, even if it is early or late. NT examination is a screening method to evaluate whether the fetus may have Down syndrome by detecting the thickness of the posterior cervical zona pellucida by B-ultrasound. It is the earliest abnormal examination during pregnancy, with an accuracy rate of about 70-80%. In general, the NT value will not exceed 3 mm. If it exceeds 3 mm, it is abnormal, which means that the fetus is at risk of Down syndrome. The greater the NT value, the higher the probability of Down's syndrome in the fetus, so it needs to be reexamined. In addition, NT examination can also observe the development of the fetus and whether there is congenital heart disease.
Down's screening: The best time for Down's screening (mid-Tang) is 15- 20 weeks of pregnancy, mainly through blood drawing, and then combined with serological indicators, gestational age, pregnant women's age, pregnant women's weight and so on. , comprehensively calculate the probability of fetal Down syndrome. Down's screening is a screening method, which can not be diagnosed and the accuracy is not very high. Even if it is high-risk, it is impossible to diagnose fetal problems. Further noninvasive DNA or amniocentesis can be done.
Non-invasive DNA: the best time for non-invasive DNA is pregnancy 12-22 weeks, and the time period is relatively long. Try not to be too early or too late. Mainly by extracting the venous blood of pregnant women, and then extracting the fetal free DNA in the blood to detect whether there is a problem with the fetal chromosome. The accuracy of non-invasive DNA is very high, up to 99%, and it is very safe without any danger. However, its inspection has certain limitations. At present, only two1trisomy syndrome, 18 trisomy syndrome and 13 trisomy syndrome can be detected.
Amniocentesis: The best time for amniocentesis is pregnancy 17-2 1 week. However, if the fetus is found to have problems after 2 1 week of pregnancy and the chromosome is suspected to have problems, amniocentesis can also be done. At present, amniocentesis is the only way to "diagnose" whether the fetal chromosome is abnormal. The main method is to confirm the fetal position by B-ultrasound, then quickly puncture the amniotic fluid far away from the fetal position, and then detect the fetal cells contained in the amniotic fluid to detect whether there is any problem with the fetal DNA. Amniocentesis has the highest accuracy, up to 100%, but it has certain risks. The greater the gestational age, the greater the risk.
Large-scale rejection test: the time of large-scale rejection test is 20-28 weeks of pregnancy, and the best time is 22-26 weeks of pregnancy. It is mainly used to check fetal malformation, confirm whether fetal intrauterine development conforms to gestational age, whether the fetus is healthy, whether limbs, brain and internal organs are abnormal, and whether amniotic fluid, umbilical cord and placenta are abnormal. Large-scale abnormal examination includes three-dimensional color Doppler ultrasound and four-dimensional color Doppler ultrasound. The inspection needs to be advanced, not too late. Although there is no danger, large-scale anomaly inspection is not omnipotent. There are still many anomalies that can't be detected, and they are greatly influenced by the fetal position. If the fetus does not cooperate and the posture is wrong, it will affect the test results.
Not all the above five tests should be done. The specific doctor will choose according to the age, physical condition and fetal condition of the pregnant woman. For the sake of fetal health, pregnant women are advised to follow the doctor's requirements.
In addition to these tests, pregnant women should do more things that are beneficial to the development of fetal brain.
Fetal brain hair has a critical period. The fetal brain began to differentiate in 2-3 months of pregnancy. At this time, the demand for nutrition in the embryonic period is not great. Pregnant women don't need supplements, but they should eat folic acid. At the same time, diet should be light, life should be healthy, stay away from all teratogenic substances, do not smoke and drink, do not take medicine indiscriminately, and do not be too anxious. Pregnancy is 5-6 months, which is a period of rapid increase of brain cells, and the fetal auditory and visual nervous systems begin to develop. Pregnant women can eat some foods that promote the development of fetal brain, such as high-quality protein, and at the same time, they can also carry out scientific prenatal education to stimulate the development of fetal brain. After 7-8 months of pregnancy, fetal brain cells proliferate and differentiate rapidly. Pregnant women can eat some foods rich in high-quality protein, lecithin and DHA, and they also need scientific prenatal education and moderate exercise, which can stimulate fetal brain development and make the fetus smarter.